...gamma-retroviral guide to learn about gamma-retroviral components, retroviral production, and common uses....require different isoforms of these packaging components. Therefore, gamma-retroviruses may not be efficiently...production, and scientists have made changes to these components for increased safety when producing viral vectors...produce gamma-retroviral vectors, these required components have been separated into distinct plasmids for...For a summary of all gamma-retroviral plasmid components, see the Gamma-Retroviral Plasmid Elements table...containing the transfer, envelope, or packaging components. The transfer plasmid encodes the gene of interest...particle containing matrix, capsid, and nucleocapsid components. pol in trans Precursor protein containing reverse...